Java Web Authentication Module -- 2

I’m putting together a small web application and need a solid email-and-password sign-in module. The tech stack is set: Java will drive the back-end, a compact C library (already written) handles our custom hashing routine, and the screens can stay simple with vanilla HTML/CSS.

Here’s what I’m after:

• Java endpoints for register, login, logout and session management, built with Spring Boot, plain Servlets or a framework you’re comfortable with.
• JNI (or another clean bridge) that calls the provided C hashing library, with step-by-step build instructions.
• Lightweight HTML pages—sign-up, sign-in, password reset—styled just enough to be readable.
• Secure storage in MySQL or Postgres, using salted, hashed passwords.
• A short README covering setup (one-command build/run) and the OWASP measures you applied.

I’ll supply the C code and an empty repo the moment we start. Code clarity and a quick turnaround are more important to me than fancy UI work. If you’ve tackled Java authentication or JNI before, that’s a big plus—share a link or two when you bid.